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UNITE THOMAS E. IVILLIAMS, OF VASHINGTON, DISTRICT OF COLUMBIA.

HINGE FOR WINDOW-BLINDS.

Specification of Letters Patent No. 22,214, dated November 80, 158.

To all whom it may concern:

Be it known that I, THOMAS E. Tintin-mis, of lVashington, in the District of Columbia, have invented a new and Improved Hinge, which I denominate a Self-Fastening Lock-Parliament or Slip-Butt Hinge; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, of which- Figure l is a front elevation, the hinge being open or back; Fig. 2 is an end elevation, Fig. 3 the same of the opposite or inner end and Fig. l a back elevation of the same end. These two latter figures are fractured so as to retain only the important details to be shown by them.

The nature of my invention consists in arranging a catch bar upon the face of the hinge in such a manner that when the blind (hinge) is thrown open or back it will be retained firmly in that position, and by applying the finger to the handle of t-he catolibar, it disengages itself, so that the blind or hinge can be shut or closed and the bar will again assume its position and without strain, completely locking the wings of the hinge together, so that to break the connection the plates of the hinge would have to be broken, or the screws of the hinge drawn.

In the construction I make my hinge similar in shape with the parliament or slipbutt hinge, but in place of a flat surface I countersink the palms or wings of the hinge (a and b) and cut out two cavities c and CZ in the upper division of the knuckle e and one f in the lower division. The two upper cavities c and Z have their sides to dove-tail downward, but the sides of the lower cavity are straight. Into these cavities the catchbar or its inner end 7L moves. rIhe catch-bar z' is placed in the countersink a of the inside palm and moves slightly around on and is secured by the center pin or screw j. This pin is moved up nearer the knuckle e so that the end h will have a quick up or down movement and its other end L will be the longest and heaviest, causing the end /L to be upward naturally. To the end 7c which projects beyond the hinge is affixed a handle Z to be moved by the fingers of the hand upward.

The operation of the hinge with the above described improvement is as follows: In Figs. l and 2, the hinge is thrown open or back. The end /L of the catch-bar z' has its surface equally divided in the cavities c and The cavity c being dove-tailed downward and the upper surface of the end 7L being dove-tailed upward, fits tightly into the cavity, preventing the hinge wabbling. Thus arranged to attempt to force the hinge or blind in, would force the screws or snap the plates or wings and as this would take place before the metal of the end /i is crushed, and in the breaking of the plate, the fracture would not occur at the knuckle e, which appears with the cavities to be the weaker point, as here the endz, bears directly upon the knuckle; the heaviest part of the hinge. Apply the linger to the handle Z, raising it, and the end L will descend into the cavity f, thus disengaging the upper division of the knuckle e, when close the hinge or blind and the catch bar will assume its firstposition with the end it equally divided and as firmly fixed as before in the cavities (Z and f, and can only be opened but by means of the handle Z.

This arrangement however perfect, is subject to further improvement by which it will be impossible to pry the parts open laterally, or upwardly by means of the line of division of the knuckle e, in other words locking the hinge together. To attain this object I place the catch m on the outer palm, and when the hinge is closed, this catch enters the aperture n of the inner palm. The catch-bar 2 descends into it, thus binding the two wings together, which cannot be pried open laterally, nor by the division line of the knuckle c upwardly, as the edges of the countersink would come against the catch-bar z', and the top of the catch m against the upper line of the aperture n. To make my hinge still more complete, I obtain a greater deal of strength in the attachment of the hinge to the blind by the use of the flange o thus binding both the end and face of the blind to the hinge, and in case the blind or. its outer edge does not come directly against the wall of the house; which is important as the wind if allowed full play would pass behind the blind, making it liable to be wrenohed off. This I avoid by either chipping out or piecing directly under the flange, until the edge is brought against the wall, when the screwing of the flange is made tight. The appearance of the blind is in thuswise not impaired.

Having thus fully described my invention by which I am enabled to hold the blind or hinge when open very firmly, and When i Substantially in the manner and for the pur- Closed to look 1t so as to resist any lateral or pose as herein set forth and described.

upward pryno upon the exterior side what /7 I claim theielbi as new, and desire to secure THOS' E' XX ILLIAMS' 5 by Letters Patent, is- Vitnesses:

The catolrbar z', and catch m in combna- I. D. CLARK, tion with the cavities c, d, and f, and hinge, l N. I. THOMAS. 

